4906505943221 has 2 divisors, whose sum is σ = 4906505943222. Its totient is φ = 4906505943220.

The previous prime is 4906505943191. The next prime is 4906505943223. The reversal of 4906505943221 is 1223495056094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4904231702500 + 2274240721 = 2214550^2 + 47689^2 .

It is a cyclic number.

It is not a de Polignac number, because 4906505943221 - 2³⁴ = 4889326074037 is a prime.

Together with 4906505943223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4906505943221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4906505943223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2453252971610 + 2453252971611.

It is an arithmetic number, because the mean of its divisors is an integer number (2453252971611).

Almost surely, 2^{4906505943221} is an apocalyptic number.

It is an amenable number.

4906505943221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4906505943221 is an equidigital number, since it uses as much as digits as its factorization.

4906505943221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 4906505943221 in words is "four trillion, nine hundred six billion, five hundred five million, nine hundred forty-three thousand, two hundred twenty-one".